Revolving chair.



' H. w. BoLENs.

' nEvoLvING 011m.

APPLIOAVTION FILED JAN. 6, 1906. Y

899,504, l Patented :septh 29, 190s.

El ih.

H. W. BOLENS. BEvoLYING 0mm. APPLICATION FILED' JAN. 6, 1905.

899,504v "Patented Sept29, 1908.

2 SHEETS-*SHEET a,

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. statement, the principal objects of my res- HARRY W. BOLENS, OF PORTWASHINGTON, WISCONSIN.

' REVOLVING CHAIR.

f specification of Letters Patent.

Patented. sept. 2e, 190s.A

Application filed January 6, 1905. Serial No. 239,836.

To all whom 'it 'may concern: Y

Be it known that I, HARRY W. BoLnNs, a citizen of the United States,'residing at Port `Washington, in'the county of Ozaukee and State ofWisconsin, have inverlted a new and useful Revolving Chair, of which thefollowing is a speciiication. e

My invention relates to im rovements in revolving chairs, especially 'tose -designed for use by type-writlsts and lsewing-machine operators,and wherein-there is comprised a back supp orting standard pivotallyconnected to the chair-iron.` l

Heretofore in this class of revolving chairs I have found by experienceseveral important defects, namely, and principally, thel principle uponwhich the chalr-iron has been constructed has'been erroneous, in ,thatthe pivotally supported back has had its fulcrumpoint too far in rear cfthe longitudinal center of the body of the occupant; and, further# more,the back has been supported too far in rear of the back of the"occupant, so that it failed to follow u the back of the occupant whenhis or her ody moved forward, and hence did not give that support to thebody which might be su os'ed and which is neces'- sary in a chair of t skind in order to accord with the-fundamental rinciples involved.

l.As may be surmise from the foregoing ent invention are to overcomethese de ects,

.and to construct achair on an anatomical principle, that'is to say,that will conforml inv its movements very closely to the move,

lments of the body of the operator from the hips up. Although theseobjects are' the principal ones invlew, yet there are other ob-` ]ects,"of less importance, such for instance as constructing a chair-iron ofvery cheap, siln-Y le andv reliable construction, and. onewhere- :1ntheadjusting device is Within easy reachof the operator, and' whereinthe'p'arts are so arranged'l asto prevent accidentally catching i fanilzltearing he cl'ot vlith these various?V ects in view thefinVvention consists, primarily, in a chair-s ider or `iron wherein s thesupportfor 'the Vstandard is fulcrumed at a 'oint lnzsubstantiallyvertical alinement Wit the hip-j oint of theoccupant, so that asthe backlof the occuant back and forth, from the hip-v fjcint, so will theback'of the chair, the. latter moving on a circle substantially.concentric spider, i are formed with' hi `joint of the occupant insteadof 'feccentri'c y asheretofore.

the same,

on the'line 4-4 of Fig. 2. Fig. 5 is a similar y view, on the line 5 5of Fig. 3. Fig. 6 is a transverse sectional view through the chair backand its clamp or support. Fig. 7 is a detail in perspective of the backstandard sup orting rocker-frame.

` e chair-seat 1, legs 2, adjusting-.post or screw 3, and back 4, are ofthe usual style which go to make up the conventional form oftype-writists or sewing-machine operators chair illustrated in Fig. l'ofthe drawings.

Rigidly secured to the u per end' of the adjusting-post or screw 3 listhe s ider 5, and as best shown in Figs. 2 and 3 t e same comprises the'threel spider-arms 6, all diver ing from a central body portion or hub7, w ich la'tter is formed with an opening for receiving the upper'endofthe adjustingost or screw 3. In the present instance illustrate a,threecontact spider, but of course the contacts may be increased simplyby' increasing and re-arrangmg the number and relative -positions ofthe' spider-arms.. Two of these" arms diverge forwardly, while thethird'extends to the rear, and each mayhave its end slightly elevated,iiattened and perforated,

derside and surrounding the hole with ,a beary ing-socket 10.

ll'designates the back-standard supportg rocker-frame `(see for detailFig. 7) and the lsaine is preferablygenralfoblong-shape,

having a slightly elevated extension 12 at its front end, and atopposite sides near the end ofthe extension bearing-lugs 13.' The frameis provided withan' elongated opening 14, to loosely receive theadjusting-post 3, and its bearinglugs 13'w-hich take between the frontspider arms *6 nearthe. hub 7 of the'.

erforations 15, which agree in alinement wlthfsimilar perforationsformed in the spider-arms. Through such perforations may be passed atransverse y yplug and resting upon the stirrup 8. The

atter extension is formed with an opening 17 (preferably square) whichalines with the aperture 9 of the stirrup 8, and through the two withits head upon the extension and its shoulder fitting loosely the saidopening 17 is an inclined tensionadjusting-bolt 18. The lower threadedend of the bolt carries a socket 19 (a companion to the socket 10), andbetween this socket and its companion 10 is a compression-spring 20,tension to which may be given by the usual nut or handwheel 21. Thishand-wheel it will be noted is located under the front edge of thechairseat within convenient grasp of the user.

Each of the longitudinal sides is upon its bottom formed with' ahalf-round recess 22, which may extend throughout its length and beslightly flattened along its middle. ,The

rear transverse part of the rocker-frame may be formed with a verticallybored boss 23, to

receive a clamping-bolt 24, provided at its lower end with a hand-wheelor nut 25.

26 designates a clamping-plate, applied to vthe underside of thetransverse part of the rocker-frame (see Figs. 3 and 5), and in order tocoincide therewith is formed with a central perforation 28, to receivethe bolt 24, and at o posite sides thereof with half-round and preerably slightly flattened grooves 29, it belng obvious that the grooves22 and 29 are designed to receive the usual spring rods 30, forming theback-standards. The latter, in order to obviate side play and conform tothe grooves 22 and 29 are preferably very slightly liattened on theirupper and lower sides, as at 31. VThe back standard may comprise twoseparate spring-rods or be formed of a single piece bent or doubled uponitself (as'shown in Fi 1). Also any desired means may be emp oyed forsecuring the back 4 to the back-standard. In the present instance Iemploy a yoke 32 (see Fig. 6) the ared ends of which are by screws 33secured tothe rear side of the back. These terminals are of suchlengthas to causethe back to set well within the vertical area of theseat, so that the back takes Well'nder the shoulderblades of the userfollowing and gently supporting the back of theuser whether his back beinclined forward or backward, in contradistinction to the usualchair-back which is of very little use unless S-theoccupant leansbackward.

The yoke 32 is Acentrally apertured, as at 34, and at each side thereofis formed a vertical half-round groove 35.

36 designates a clamping-plate,the' same being centrally apertured, asat 37, coincident with the aperture 34 of the yoke.

lThrough these apertures 34 and 37 is passed a bolt 38, vat the outerend of which is located the hand-wheel or clamping-nut 39. Theclamping-plate is formed witli opposite halfround grooves 40, companionto the grooves 35 of the yoke, and the two receive the upper portions ofthe back-standard rods.

It will be obvious that the back 4 is ca able ofbeing verticallyadjusted upon the iiackstandard; that the latter carrying the back maybe laterally adjusted within the rocker plate, and, furthermore, therocker )late may be given the desired tension through the Wheel 21.

It will be seen that in all pivotal movements of the back 4 and itsstandard the rocker-plate rocks or vibrates upon its pintle 16, and thatthe latter is located as near the center of the seat and therefore thehip-joint of the user or occupant as practicable. The result is that therocker-frame, and hence the back 4 move upon a circle th'- center ofwhich is substantially concentric with the hip-joint ofthe occupant, andin this manner the back 4 is caused to' describe substantially the samecircle as the back ofthe occupant, thus obviating all rubbing, whichlatter results from the-back of the seat and that of the occupant movingupon eccentric circles.

Of course various'modifications will suggest themselves for securing thesame or substantially the same results, and I desire it understood thatI do not limit my invention to the exact ldetails herein shown anddescribed. l

Having thus described my invention, what I claim as new and desiretosecure by Letters-Patent, is

1. The combination of a seat post, a spider frame mounted thereon andprovided in advance thereof with afstirrup, a rocker frame pivoted inthe spider frame and extending opposite the stirrup, a tension deviceconnecting the stirrup and rocker frame and a back frame carried by therocker frame.

2. The combination, of a swivel-post, a spider-frame mounted thereon andprovided in advance thereof with a stirrup, a rockerframe, pivoted inthe spider-frame and extending opposite the stirrup, a tension deviceconnecting the stirru and rocker-frame, and means for securing t 1eback-standard to the rocker-frame.

3. The combination, of a swivel-post, a sp1der-frame mounted thereon andprovided in advance thereof with a stirrup, a rockerframe pivoted in thespider-frame and having an extension overla ping the stirrup, a springcarrying tension-bolt passed through t e stlrrup and said extension, andprovided with an adjusting means, and means for securing a back-standardto said rocker-frame.

4. The combination, of a swiveled post, a spider-frame mounted thereon,a lever like rocker-frame receiving the post and fulcrumed on thespider-frame in advance of the post, opposite grooves formed in theunderside and at opposite sides of the lever likeA rocker -fran1e, asimilarly grooved clam plate thereunder, a set-boltvconnecting t 1e two,and a tension-device for the lever like rocker-frame and arranged inadvance of' the ost. v

P 5. The combination,V of achair-spider having forwardly disposedarms, atransverse depending stirru a lever like rocker-frame intermediatelyulcrumed in the. spider-frame and at its front end overlapping saidstirrup, a tension deviceconnecting the stirrup and front end of thelever like rocker-frame, and means for securing the back-standard to therockerlate.

6. T e combination, of a chair-spider comprising a centralhub, forwardlydisposed spider-arms, and a transverse depressed connecting stirrup, anoblonglever like rockerrame provided with a front extension apertured.and overlapping the stirrupand pro- A vided in rear thereof withperforated bearing-- ears taking between the rear endsof said forwardlydisposed spider-arms and at its opposite sides having longitudinalgrooves, aV

v ing the two. A

- 7. Ina chair, the'combination with the back and the spring-supportingrods, of the yoke 32, centrally apertured, as at 34, and grooved, as at85, to receive the rods, the apertured clampinglate 36, grooved as at40, the bolt 38, and t e hand-wheel 39.

In testimony whereof I have signed my name to this specification in thetwo subscribing witnesses.

" HARRY W.

, p BoLENs. Witnesses:

'W. S'. DUVALL,

C. F. DUv'ALL.A

presence of

